+ * @param bool|null $config['relative'] If a namespace is set,
+ * return a title relative to it (default: true)
+ * @param bool|null $config['suggestions'] Display search suggestions (default: true)
+ * @param bool|null $config['highlightFirst'] Automatically highlight
+ * the first result (default: true)
+ * @param bool|null $config['validateTitle'] Whether the input must
+ * be a valid title (default: true)